When running the OpenGL program Celestia v1.6.1
which is available at http://sourceforge.net/projects/celestia/files/
dragging the mouse in its window with either or both mouse buttons held
down seems to cause the application to receive many more mouse evemts
than it should or to receive unrealistically large mouse motion values.

When the LMB is dragged, the selected object should move the same amount
of distance that the mouse is dragged. Instead it "leaps off the screen"

When the RMB is dragged, the selected object should rotate smoothly.
Instead it rotates by unpredictably large amounts.

When both buttons are held down simultaneously, the selected object
should move at a moderate speed toward or away from the viewpoint.
Instead it immediately becomes extremely close or invisibly distant.

Exactly the same symptoms are seen when running Celestia in both guests
and whether or not 2D or 3D graphics acceleration is enabled.

These symptoms are not seen when running on the host.

I am attaching a zip file containing VirtualBox logs recorded while
running Celestia under Win8.